Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467cfb1ee8c4f80…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 11:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8eb899f27f2a45c38de9f27be148c4d3 SHA-1: 19cf5f7dda95bc22230620318895e143a7824360 SHA-256: 6467cfb1ee8c4f802f1bf294b8a91d7c6346506ffa31ba0783f677c76c6ef537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of multiple malicious URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://e-photo.lv/ckfinder/userfiles/files/boluwulowotiwa.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ginikibafet.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/42863361354.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/81481917089.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/sibeta.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/gonimimuxejijorote.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xotetirunipab.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379ef88e9a5---jikefalesajawamalavala.pdfIn PDF document text
    • http://geoman.cz/data/file/683219742.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/jigikenotafelutidesaru.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/zogumerebe.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/78409270502.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/40996901438.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/51980701411.pdfIn PDF document text
    • http://skrn.cz/pic/file/38992701820.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/lusoxofewelelugu.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/76754863108.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/98571787936.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/movifozuxemoretireke.pdfIn PDF document text
    • http://uteambio.com/upload/files/16751608603.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e45564f6---gasewabotivabunidaviwe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7f348a36---gikegonixaxubedalijoveki.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9ok6pdaaqvlcl2se63sd63m10m/deserawotizisafajatopafuw.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vexej.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c7be6e6---tufigakebubisezenafub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+mirror+mobile+screen+on+laptop+via+usbPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 17804 bytes
SHA-256: 02120d60b7d273696a9616e918e283dfdf58dd4db8e00033298dfd1a03c6f4c4
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10916 bytes
SHA-256: e7e1a0ef8c4430f215348c2d84232ad650c39e0ac6a3dc11ae8f3c9b507a06fd

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